The murder of a 50-year-old grandfather who was blasted to death with a sawn-off shotgun in front of his wife and grandchildren cost Avon and Somerset Police an estimated £600,000 to investigate.

Figures released by the county force under the Freedom of Information act show that £108,633.08 was spent on police travel, overtime and additional costs during the inquiry into the murder of Wilfred Isaacs Snr and the shooting of his son, Wilf at Chubbards Cross caravan site.

But that figure does not include normal police officer time and it is believed the real cost of Operation Sweden was closer to £600,000.

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The investigation involved 378 officers and staff, with 25 people making up the core investigation team.

Police logged 1,264 exhibits, took 447 statements, filed 267 reports and recorded 1,263 documents such as maps and photographs.

Overtime was the biggest bill in the investigation, with officers racking up £26,830.34 in additional hours, £6,850 for overtime by police sergeants and police staff logging an extra £12,181.77 of overtime.

There was also £17,708.00 for ‘fees and hired’ and a £3,693.02 catering bill.

A police spokesman said: "This was an extensive and fast-moving inquiry which involved a wide range of policing resources including the Major Crime Investigation Team, Investigations, Local Policing, Catch and Disrupt teams, Crime Scene Investigators/Managers, Intelligence staff and Communications personnel.

The shotgun used to kill Wilfred Isaacs Jnr (Image: A&S Police)

"A large number of partner agencies and professionals have also been involved, especially in the run-up to the trial, including medical, forensic and ballistic experts.

"In the region of 1,260 exhibits were seized, including bloodstained clothing found at the site, and a thorough forensic examination was conducted of the whole site, which took almost three weeks.”

The murder of Wilfred Isaacs Snr and the wounding of his son, Wilf Jr, was the result of a long-running feud between two traveller families - the Broadways and the Isaacs.

The families had not been 'on speaking terms' for a number of years, but lived side by side at the Chubbards Cross Caravan site near Ilminster and there had been a fight between members of the Broadway family and members of the Isaacs family shortly before the shooting at the site on May 5 last year.

Wilfred Isaacs Snr died in a fatal shooting at the Chubbards Cross Caravan Site near Ilton in May 2016

After the shooting John and Charlie Broadway fled the site, with John leaving with his sister Bonnie Wilson in her BMW, and Charlie leaving in a Vauxhall Astra, leading to a nationwide manhunt.

Charlie handed himself in at Bridgwater Custody Centre the following day, while extensive police enquiries resulted in the arrest of John in Lichfield, Staffordshire, on Saturday 7 May.

After the shooting, police found a number of guns on the site – including the 12 gauge sawn off shotgun used to shoot Wilfred Snr and his son, which was hidden in a toilet in a disused wash building.

The scene of the shooting at Chubbards Cross

Charlie was sentenced to a minimum of 34 years in prison after he was found guilty of murdering Wilfred Isaacs and the attempted murder of Wilf Junior.

He was also sentenced at Bristol Crown Court for these offences, as well as charges of unlawful wounding - for an assault on Wilfred Senior earlier the same day – and ABH for a prior assault on Wilfred Junior.

John and William Broadway were sentenced to 15-years (plus an extended four years on licence) and 12 years respectively after being found guilty of the manslaughter of Wilfred Senior.

John (left) Charlie (centre), and Billy Broadway (right)

Bonnie Wilson was sentenced to 18-months' imprisonment, suspended for two years, after being found guilty of assisting an offender, while Joseph Finney, 23 and Riley Joe Jones, 21, were jointly convicted with Charlie of unlawful wounding and ABH.

They were both sentenced to 15-months' imprisonment, suspended for two years.